Improvement in tool for moulding dovetails



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@tutti dettare.

l BERNARD MCENADLY AND EDWARD EARRELL, or] DETROIT, MICHIGAN.

Letters Pate/ag No. 97 ,308, dated Nove/aber 30, 17869; rui/tedatcd November 13,v 1869.

IMPROVEMENT IN TOL FOR MOULDING DOVETAILS. f

The Schedule referred to in these Letters Patent and making part of the same.

To whom it' may concern.-

Beit -know'n that we, BERNARD MCENALLY andI specification. v V

Figure lis a top viewfwith the cover removed, to

show the internal mechanisni.

Figure 2 is a side elevation in the left-hand half of the sketch, and a vertical central section in the righthand portion, both showing the position of the lugs, when the implement is at rest, or when entering and leaving the sand.

Figure 3 is a similar view of the same, showing the position of' the lugs in form-ing the, dovetails in the sand.

Like letters indicate like parts in each figure.

`The nature of this invention relates to-a tool `to be used by' moulde'rs of stove-plates, by meansof which the lugs for forming the dovetails upon the under side of the bottom plate, forholding the stove-legs in' place, are moulded in the sand, accurately, and with far greater certainty and less trouble than they can be produced by the ordinary methods. y

The invention consists of a pair of pattern --lugs worked by t-humb-levers and springs, the whole arranged in a suitable frame, and adjustable to suit the di'erent sizes of legs to beY used by means of proper set-screws.

. It also consists in a peculiar arrangement of all the various parts.

A, in the drawings,,represents a suitable metallic frame, enclosing the mechanism of the tool.

B are pattern-lugs, whose relative posit-ion is somewhat diagonal to the bottom plane of the frame, as Shown iu dotted lines in fig. 1.

These pattern-lugs are provided with arms, C and D, the arms C being secured -to the cross-bars- E, while the arms D are fulcrumed to the cross-heads F.

' G are thumb-levers, fnlcrumed to the bifurcated arm H of the cross-head.

The lower ends of these levers are hooks, as shown, and these hooks engage with the under side o f the cross-bars E, the longitudinal centre of Which is rounded oii for the purpose, shown in the sectional portions of' gs. 2 and 3.

I are set-screws passing through and secured into the ends of the frame, and engage with the crossheads F, and by their means the distance between the lugs is determined, as may be necessary.

J are spiral or other springs, by means of which the lugs are brought backto place, as in iig. 2, after the pressure uponthe thumb-levers in fig. 3 has been released.

The distance betweent-he lugs having been determined, by mea-ns of the set-screws, to fit the lugs to be used, and the pattern of the stove-plate'mouldedY 4in the ordinary way, the lugs being in the position shown in fig. 2, are inserted into the cavity in the sand Vformed by the print, when, by pressing together the thumb-levers, the vcross-bars E are elevated, carrying with them the ends of the arms C, by means ofwhich the lugs assume the position shown in fig. 3, compressing the sand between them. This being done and the pressure upon the thumb-levers being removed, the springs restore the lugs to their original position, when the Vtool may be taken away.

The diagonal position ofthe lugs, with the plane of the bottom, as in iig. 1, enables the operator to make the double dovetal required for the purpose.

What we claim as our invent-ion, and desire to secure by Letters Patent, is-

The arrangement of the lugs B, the arms C and D, the cross-bars E, the cross-heads F, the thumb-levers G, the bifurcated arm H, the set-screws I, and the springs J, in connection with the frame A, when constructed and operating as and for the 'purpose above described.

BERNARD MCENALLY.

Witnesses: EDWARD .FARRELL H. F. EBER'Is, r JAS. I. DAY. 

